﻿/************************************************************************

   Extended Silverlight Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://extendedsilverlight.codeplex.com/license

   Please purchase a commercial version of this toolkit if you are using
   it in a commercial product. The commercial versions support the project,
   and also include more features for each control, priority support,
   source code, updates, removed watermark, and a proprietary license.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System;
using System.Diagnostics;

namespace Xceed.Silverlight.DataGrid
{
  [DebuggerDisplay( "Length={Length}, IsPixels={IsPixels}" )]
  internal struct OffsetLength
  {
    public static readonly OffsetLength Zero = new OffsetLength( 0, true );

    public OffsetLength( double length, bool isPixels )
    {
      if( !isPixels )
      {
        if( length < -1 || length > 1 )
          throw new DataGridInternalException();
      }

      this.Length = length;
      this.IsPixels = isPixels;
    }

    public double ConvertToPixels( double elementLength )
    {
      if( elementLength < 0 )
        throw new ArgumentOutOfRangeException( "elementLength", "elementLength must be greater than zero." );

      return ( this.IsPixels )
        ? this.Length
        : ( this.Length * elementLength );
    }

    public readonly double Length;
    public readonly bool IsPixels;
  }
}
